title: [Comparison of the Lithander (Kolt test) pediatric visual acuity test with the standardized Landolt ring test].
abstract: The visual acuity values obtained with the four test figures of Lithander's "Kolt-test" have been compared with Landolt ring acuity under standardized conditions which meet the requirements of DIN 58,220 and ISO/DIS 8596/7. For a given test figure size, the Kolt-test optotypes turned out to be somewhat easier legible than the Landolt ring. On average, visual acuity measured with the Kolt-test exceeded Landolt ring acuity by 0.08 log (angle of resolution) units. Thus, according to DIN and ISO criteria, the legibility of the Kolt-test is not equivalent to the standard Landolt ring. Equal acuity values could be obtained by increasing the observation distance proposed by the manufacturer of the Kolt-test by 19%. The legibility of the four optotypes differs on adult subjects: "circle" is more difficult, "cross" is easier legible than "square" and "triangle". Confusion of Kolt-test figures is basically restricted to two pairs of two optotypes ("cross" - "triangle", "square" - "circle").
authors.affiliation: Abteilung für Medizinische Optik, Universitäts-Augenklinik Hamburg.
authors.forename: H
authors.initials: H
authors.lastname: Cavazos
authors.forename: E
authors.initials: E
authors.lastname: Schulz
authors.forename: B
authors.initials: B
authors.lastname: Rassow
authors.forename: W
authors.initials: W
authors.lastname: Wesemann
mesh_terms: D000328:Adult; D002648:Child; D006801:Humans; D010364:Pattern Recognition, Visual; D012016:Reference Values; D014787:Vision Tests / Q000379:methods / Q000592:standards*; D014792:Visual Acuity
vernacular_title: Vergleich des Kindersehschärfetests nach Lithander (Kolt-Test) mit dem standardisierten Landoltring.